advice on a pretty unique situation

Hello all, I'm in a marriage, having been with this woman for 8 years now. I posted last year detailing a suspected EA while living abroad. It turns out there was no EA at all (confirmed), but I think I've fallen out of love. Believing that there was another presence in her life was a way of convincing myself that she wasn't responsible for her behavior. i.e. "it couldn't really be her treating me this way because she would never do this" I've given it a year (as the advice typically goes on these things) but the feelings for her haven't come back even though things are generally good between us. There is nobody else (or anything even close) and we are getting along well, very good active sex life, and staying together is the convenient thing. But I just don't feel the same way as I did before and it scares me. We have no children, but she is approaching the age where she will need to make a decision on that. I can't imagine having kids with her given how I feel-- this likely won't be an issue for us but if we break up later on she might regret it, I don't know. I googled "why men fall out of love" and the list I found had the number one reason as "they feel like you don't have their back." Frankly, that's exactly what happened. I can give more history if it's important but it seems to me that the lack of feeling from me is the most important thing (rather than the "why" of it.) I just feel like a faker in the relationship pretending that everything is how it used to be. Anyway, she's a great person who deserves to be happy, but I can't imagine she'll be happy with me in the long run given how I feel. Any advice would be appreciated here. I know this is probably weird because a. I'm a man considering initiating the separation, and b. there are no affairs or abuse or any other major problems. It would be so easy to just ignore this and carry on with my life but I've got this nagging feeling that I need to do what's right here. Thanks to this excellent community and the support you all provide.

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